<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        p{
            width: 100px;
            height: 100px;
            border: 1px solid #ad2828;
        }
        span{
            width: 100px;
            height: 100px;
            border: 1px solid #000;
        }
        input{
            width: 100px;
            height: 100px;
            border: 1px solid #2e9537;
        }
    </style>
</head>
<body>
    <div>hello</div>
    <p>彭于晏</p>
    <span>world</span>
    <a href ="http://www.baidu.com">百度</a>
    <input type="text">
</body>
</html>